Machinery for beveling the edges of glass lenses and the like



June 5, 1923. 11,457,855 5. RICHARDSON MACHINERY FOR BEVELING THE EDGES OF GLASS LENSES AND THE LIKE Filed April 4, 1921 2 Sheets-Sheet 1 June 5, 1923.

S. RICHARDSON MACHINERY FOR BEVELING THE EDGES OF GLASS LENSES AND THE LIKE FiQLed April 4, 1921 2 sheatsfihoet 2 Patented June 5, i323.

UNHTE STATES PATENT @FFEQE.

SIDNEY RICHARDSON, F HATTON GARDEN, LONDON, ENGLAND.

MAGHINERY FOR BEVELING THE EDGES 0F GLASS LENSES AND THE LIKE.

Application filed April 4,

To all whom it may concern Be it known that I, SIDNEY RICHARDSON,

a subject of the Kin of Great Britain, re-

siding at 37-38, llatton Garden, in the county of London, England, have invented certain new and useful Improvements in or Relating to Machinery for Beveling the Edges of Glass Lenses and the like, of which the following is a specification.

This invention relates to machinery for beveling the edges of glass lenses and the like, and has particular reference to automatically-acting apparatus of the kind in which a bevel-edged grinding wheel is em- 15 ployed for makin a single or dpuble bevel edge on spectacle enses. The ob ects of the present invention are to provide a lens-beveling machine of this typeof simplified construction in comparison with apparatus at heretofore employed, and by means of which improvements in the quality of the results obtained therewith are attained.

According to the present invention for the beveling of spectacle lenses and thelike,

there is employed a grinding wheel having a V-shaped or double bevelled edge. It 1s to be understood that by the expression V or double bevelled edge is meant a double bevel which in cross-section is of a male or 80 projecting form, in distinction to a reentrant, grooved, or hollow form.

A feature of this invention, for the production of double bevelled edge lenses, consists in providing for the mechanical movement of the wheel and lens relatively to one another in a direction substantially parallel to the axis of the lens-carrying spindle so as to enable the bevel edges of the wheel to grind successively bevel edges of opposite co inclination on the lens. This relative move ment of the lens and grinding wheel may be made automatic and of a reciprocating nature so as to enable each bevel edge of the wheel to grind repeatedly but alter- (15 nately on the periphery of the lens any desired number of times, until the edges of the lens have been ground to the required form and size.

In order that the said invention may be clearly understood and readily carried into effect, the same will now be described more fully with reference to the accompanying drawings, in which Figure 1 is a side view and Figure 2 an as dge View of the grinding wheel.

1921. Serial lilo. 458,494

Figure 3 is an elevation of the grinding wheel and lens as arranged for making a single bevel edge on the lens.

Figure a is an elevation of the grinding wheel and lens showing the second position to of the lens during the production of a dou-' b le bevel or V edge on the lens.

Figures 5 and 6 are a plan and an end elevation respectively of a lens grindin. and beveling machine in accordance wit as this invention.

Referring first more particularly to Figures 1 to 4, the grinding wheel 1 of stone or other suitable abrasive material has its periphery cut to a V form so as to form bevel to edges 2, 3 on either side of the central plane 4 of the wheel. The lens 5 mounted on the rotatable spindle 6 is adapted to be brou ht into contact with an edge of the wheel an is thereby ground to the required size and to shape and at the same time bevelled with either a single bevel edge as shown in Figure 3, or with a double bevel edge as shown in Figure 4. In thelatter casethe spindle 6 may be so arranged as to transfer the lens autoniatically from side to side of the bevel edges of the grinding wheel, as will be hereinafter described.

In the lens grinding and beveling machine shown in Figures 6 and 7, the bevel as edged grindin wheel 1 is mounted on the shaft 7 and dr1ven by the main driving pulley 8 thereon. lhe lens 5 carried by the rotatable spindle 9 is fixed in position be tween pads 10, a tightening screw 11, with a a0 spring adjustment being provided for clamping the lens firmly between the pads. From the shaft 7, power is transmitted by belt pulleys 12 and 13, epicyclic reducing gear in the box 14, and belt pulley 15, to the 5 belt pulley 16, the sizes of the various pulleys .and the epicyclic gearing being arranged so that the pulley 16 which drives the spindle 17 has its speed of rotation reduced to the desired fraction of the speed of rota- 11% tion of the shaft 7. By means of a clutch 18,

the pulley 16 can be thrown into or out of driving connection with the spindle 17 as required. The said spindle 17 is provided with a cam device 18 working in conjunc- 11% tion with a stationary pin 18 for giving said spindle a reciprocating motion in the direction of its length. Rotation of the spindle 9 is effected by means of a gear wheel 19 meshing with a gear wheel 20 carits the correct position other end can be attached to a fixed supshown in the drawings.

- The desired form and shape imparted to the A plate 27 having edges bevelled to correspond said tion can then be proceeded with by causing ried by the spindle 17 and at the same time reciprocating motion imparted by the cam the spindle 9 is subjected to the same recip- 18 to the spindle 9 through'the swivel heads rocating movement as the spindle 17 as the former spindle is mounted on swivel heads brought into contact by attachment of the 21 carried by the spindle 17. An indicator free end 25" of the spring 25 ,to its fixed 22 showing the position of the cam is also support.

provided so that the cam can be brought to nstead of constructing the machine so when centering the lens. that the lens has a forward and backward By means of the plate 23 and adjusting as well as a rotational movement, the same screws 24, the two spindles 9 and 17 can be effect may be secured by arranging for the moved nearer to or further from the grindlens to remain stationary, save for itsrotaing wheel 1 as may be found necessary. For tional movement, and for the grinding bringing the lens into contact with the wheel both to rotate and have a reciprocatgrinding wheel and retaining the edges of ing motion in the direction of its driving the lens and wheel in contact during the shaft so that the lens is ground and bevelled grinding and beveling operation there is emalternately by first one and then the other ployed a spring 25, one end 25 of which is edge of the grinding wheel in the same manconnected with the swivel head 21 while the ner as takes place with the arrangement What I claim and desire to secure by Letters Patent of the United States is lens is controlled by means of a template 1. An apparatus for beveling the edges of 26, shaped so as to correspond with the final spectacle lenses and the like comprising, in form to which the lens is to be ground; the combination, a grinding wheel having a V template 26 is mounted on the same spindle or double bevelled edge of male or project- '9 as the lens, and co-acts with a guiding ing form, means .for mechanically rotating wheel, means comprising a rotatable with those of the grinding wheel, but {no swivelling spindle for supporting the lens, vided with a protuberant part 28 in place of a rotary and reciprocatory driving spindle the sharp edge where the two bevelled means for imparting rotation and reciproplanes would normally meet so as to prevent cation from said driving spindle to said lensthe lens grinding on the line of junction carrying spindle, means comprising a cam of the two bevel edges of the grinding wheel. device for imparting a longitudinal recipro- The template may however if desired be of cating motion to said driving spindle, and any bevel edge form without the pr'otumeans for regulating the distance between berance shown in the drawing. By m n of the axis of rotation of the grinding wheel a i r m ter dj t nt 29 th di tan and the axis of rotation of the lens during b t en th t m lat 26 a d it uidin the rotation and reciprocation of said lensplate 27 can be adjusted in accordance with c rrymg spindl the size to which it is desired to grind the n apparatus for beveling the edges port on the machine as and when required.

1 of spectaclelenses and the like comprising, The operation of the machine is briefly as In comblnajtlonfl a gl'mdmg Wheel havmg a f 11 V or double beveled-edge of male or prot th jecting form, means for mechanically roindicator 22 for causing the correct centert ing said wheel. means comprising a 1'0- in f the l ns, and th len i th r i tatable swivelling spindle for supporting t d i lac b t th d 10 on th the lens, means for advancing the spindle i dl 9 d l d i iti b th towards the Wheel, a rotary and reciproid f th ti ht ni Screw 11 Th thi k catory (lI'lVlI'lg spindle for actuating the ness of the pads 10 depends on the thickness y s v ir a of the rti ul l t h t at d d cam dev ce for imparting a longitudinal rethicker or thinner pads are employed as may p q a -J to 531d i g PK H be necessary to bring the lens into an acg g P P Q h y g P l curately central position with regard to the and the l flf slllndle 531d grinding wheels as shown in Figures 5 and y g p 7 connecting means 6 Th di t b t th t l t 2 tween the said lens-carrying splndle and said and the guiding plate 27 is adjusted by I'lVll'lg spindle whereby sald lens-carrying means of th micro et r 29 i accordance spindle is permitted to swivel and has imith th size t hi h th l i t h parted to it the longitudinal reciprocating u d, Th g indin d h li operamotion of the driving spindle, and means for regulating the distance between the axis the lutch 18 to ngage ith th ll 16 of rotation of the grinding wheel and the which is rotated by the driving The cam 18" is first set relatively belt wh axis of rotation of the lens during the rotathe machine is running, a double bevelled tion and reciprocation of said lens-carryedge being given to the lens owing to the 111g spindle.

21, and the edges of the lens and wheel being menses 3. An apparatus for beveling the edges of spectacle lenses and the like comprising, in combination, a grinding wheel having a V or double bevelled edge of male or projecting form, means for mechanically rotating said wheel, means comprising a rotatable swivelling spindle for supporting the lens, a rotary and reciprocatory driving spindle for actuating the lens-carrying spindle, means comprising a cam device for imparting a longitudinal reciprocating motion to said driving spindle, gearing connecting the lens-carrying spindle and the driving spindle for rotating said lenscarrying spindle, connecting means between the said lens-carrying spindle and said driving spindle whereby said lens-carrying spindle is ermitted to swivel and has imparted to 1t the longitudinal reciprocating motion of the driving sp-indle-,and means for regulating the distance between the axis of rotation of the grinding wheel and the axis of rotation of the lens during the longitudinal displacement of the lens-carrying spindle whereby both edges of the lens are ground during one forward or backward rotation and reciprocation of said lens-carrying spindle, said regulating means comprising a template earned by the lens-carrying spindle and a guiding plate bevelled to correspond with the bevelled edges of the grinding wheel and co-acting with said template whereby the extent of the swivelling movement of said lens-carrying spindle during its longitudinal movement is regulated to the required degree.

4. An apparatus for beveling the edges of spectacle lenses and the like comprising, in combination, a grinding wheel having a V or double bevelled-edge of male or projecting form, means for mechanically rotating said wheel, means comprising a rotatable swivelling spindle for supporting the lens, means for advancing the spindle towards the wheel, a rotary and reciprocatory driving spindle for actuating the lens-carrying spindle, means comprising a cam device for imparting a longitudinal reciprocating motion to said driving spindle, gearing connecting the lens-carrying spindle and the driving spindle for rotating said lens-carrying spindle, connecting means between the said lens-carrying spindle and said driving spindle whereby said lens-carrying spindle is permitted to swivel and has imparted to it the longitudinal reciprocating motion of the driving spindle, and means for regulating the distance between the axis of rotation of the grinding wheel and the axis of rotation of the lens during the rotation and reciprocation of the lens-carrying spindle whereby both edges of the lens are ground during one forward or backward longitudinal movement of said lens-carrying spindle, said regulating means comprising a temcombination, a grinding wheel having a V or double bevelled edge of male or projecta ing form, means for mechanically rotating said wheel means comprising a rotatable swivelling spindle for supporting the lens, a rotary and reciprocatory driving spindle for actuating the lens-carrying spindle, means comprising a cam device for imparting a longitudinal reciprocating motion to said driving spindle, gearing connecting the lens carrying spindle and the driving spindle for rotating said lens-carrying spindle, connecting means between the said lens-carrying spindle and said driving spindle whereby said lens-carrying spindle is permitted to swivel and has imparted to it the longitudinal reciprocating motion of the driving spindle, and means for regulating the distance between the axis of rotation of the grinding wheel and the axis of rotation of the lens during the rotation and reciprocation of the lens-carrying spindle whereby both edges of the lens are ground during one forward or backward longitudinal movement of said lens-carrying spindle, said regulating means comprising a template carried by the lens-carrying spindle and a guiding plate co-acting with said template, said guiding plate being bevelled to correspond with the bevelled edges of the, grinding wheel and provided with a protuberance between the bevelled planes.

6. An apparatus for beveling the edges of spectacle lenses and the like comprising, in combination, a grinding wheel having a V or double bevelled-edge of male or projecting form, means for mechanically rotating said wheel, means comprising a rotatable swivelling spindle for supporting the lens, means for advancing the spindle towards the wheel, a rotary and reciprocatory driving spindle for actuating the lens-carrying spindle, means comprising a cam device for imparting a longitudinal reciprocating motion to said driving spindle, gearing connecting the lens-carryng spindle and the driving spindle for rotating said lens-carrying spindle, connecting means between the said lens-carrying spindle and said driving spindle whereby said lens-carrying spindle is permitted to swivel and has imparted to it the longitudinal reciprocating motion of the driving spindle, and means for regulating the distance between the axis of rotation of the grinding wheel and the axis of rotation rec of the lens during the rotation and reciprocation of the lens-carrying spindle whereby both edges of the lens are ground during one forward or backward longitudinal movea ment of said lens-carrying spindle, said regulating means comprising a template carried by the lens-carrylng spindle and a gulding plate co-acting with said template, said guiding plate being bevelled to correspond with the bevelled edges of the grinding wheel w and provided with a protuberance between its bevelled planes.

SNEY RICHARDSON. 

